You've got to be kidding me. Borg once outran an OLYMPIC RUNNER in some sort of friendly competition. He was the fittest and fastest tennis player probably ever in terms of pure speed. Nadal is fast, but he won't outrun an olympic runner, trust me. Borg was practically from another planet in terms of physical attributes.

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That is very true.
Most of top players have been excelent movers
Open era: Laver,Rosewall,Nastase,Gerulaitis,Borg,Connors,Mc Enroe,Wilander,Kriek,Lendl later on,Chang,Sampras,Edberg moving vertically,Rafter,Hewitt,Nadal,Federer and Murray to name the quickest